Dust-collector.



PATENTEDAUG. 4-, 1908.

A. o. BARTL ETT. DUST COLLECTOR. APPLIOATIQK FILED 0011, 1901.

c7 Zia/fat.

UNITED STATES PATENT. OFFICE- AUBREY CLAUDE BARTLETT, OF YERRAXDERIE, i \'E\\' S OUTH VFALES, AUSTRALIA.

Busts-COLLECTOR."

Specification of Letters Patent.

Patented Aug. 4, 1908.

Application filed October 1, 1907. Serial No. 395,346.

To all whom it may concern:

Be it known that I, AUBREY CLAUDE BART- LET'L, a subject of the King of Great Britain, residing at Yerrandcrie, in the State of New South lVales, Australia, have invented certain new and useful Improvements in Dust drill, in which air under pressure passes along a. hole-or perforation through the length of the drill and escapes at the cutting portion or bit, the object of thus directing the air being to blow away the disintegrated matter from the hole being drilled. i The apparatus constructed in accordance withmy' invention is especially adapted for use in connection with hand pneumatic hammer drills, and consists essentially of a rigid air box or chamber surrounding the exterior of the hole to be drilled and closing around the drill: the air box being held in position by an adjustable spring; means being pro vided for allowing the drill to work out of line with the air box and also for a tube leading to a receptacle containing media for arresting dust and purifying the air.

In order that my invention may be the more easily understood reference may be made to the accompanying drawings, in

which- Figure 1 is a side elevation showing my apparatus connected with a pneumatically operated drill. Fig. 2 is a sectional view of part of Fig. 1. Fig. 3 is a sectional view of the dust arrester and air purifier drawn to a smallerscale than Fig. 1 tion of the air box (to be hereinafter described) taken from the-back. Fig. 5 is an elevation of the air box taken from the front, while-Fig. 6 is a sectional view showing an alternative form of air box packing. Figs. 2, 4, 5 and 6 are drawn to .3. larger scale than Fig. l.

In these drawings 1 is the drill which is provided with the hole or perforation 2. This perforation has its outlet at the cutting edge or hit 3.

Fig. 4 is an eleva-' 4 indicates a pneumatic machine (part only of which is shown) containing mechanism for acting in the well known manner on the end of the drill 1.

5 is the hole being drilled and 6 isthc working face;

7 is an air box which surrounds the drill 1 (see Fig. 2). This is rovided with a packing' ring 8 of soft ru beror other suitable material. This acking is designed so that it may be presse a ainst the face of the rock 6, to effect an air tight joint around the exterior of the hole 5 between the box 7 and the face 6. The box is provided at the back (see Fig. 2) with a taperedrecess or seat 9 torcceive a packing pad or plug 10. This pad or plug 10 surrounds the drill l, and niay be formed of a rubber ring wound with soft hemp, its object being to make an air tightjoint between the box 7 and thcdrill 1 and allows the drill to operate out of line with the air box. The pad or plug 10 is backed up by a spring 11, which presses same tightly against the tapered recess or seat 9: it also holds the box 7 and the packing S in position, and presses the latter tightly against the face of the rock 6. The spring 11 may be-restrained at the back (see Fig. l) by a collar 12, secured on the drill! by aset screw 13, or otherwise. I

On the lower part of the box 7 is a shortprojecting tube 14 desi ned to have connected with it one end 0? a flexible pipe 15. The ipe 15 proceeds into a receptacle l6 (see *ig. 3) containing water or other suitable liquid or medium 17; the end of the ipipe 15 is a short distance under the surface 0 t 10 liquid 17. If desired the water 17 may contain some purifying agent (such as permanganate of potassium or the like) to better it the air for human use.

.Vhen the drill l is in operation, the air under pressure passes along the perforation 2 and escapes at the cutting edge or hit 3 into the hole 5. The air passes between. the drill l and the inside of the hole 5 to the air box 7, carrying with it disintegrated matter produced by the action of the drill, down the pipe 15 and into the receptacle 16 a short distance under the liquid '17. The air passes through the lit uid and escapes to the atmosphere, while the particles of matter sink to the bottom of the receptacle 16, as shown at qzxmw-j, ma i n M M v 18 (Fig. 3). ,The accumulated matter will require to he removed at intervals from the receptacle 16 and fresh liquid added.

Referring to Fig. 2, the form of packing 1 5 illustrated therein, namely the pad orplug l0 and the tapered recess or seat 9, enables the drill 1.to be turned somewhat, as is required in order to produce a. circular hole. An' alternative form of acking is illustrated in Fig. 6-here the air box 7 is reduced in diameter at the back by two annular steps 19 and 20. A tube 21 of strong air proof canvas, rubber or other suitable material is provided, one end of which is bound by a wire 22 to the annular step and the other end of which encircles a rubber ring 23, the latter being of such a diameter and degree of elasticity as to close tightly all around thedrill 1. The spring 11 encircles and grips the annular 20 stem 19. The other parts are as described wit reference to Fig. 2. It is obvious that 1 the form of packing may be varied to a considerable extent. I would referably V cmploy a small amount of a lu ricant such as lack lead to reduce the friction and conseyquent wear between the drill andthe rubber ring 23 or pad 10. \3 claim as my invention:-:

\'- 1. In a dust collector the combination with I so ,ad ollow drill throu h which air under pressure passes to the hole being drilled, of a rigid air box around said drill and exterior of the hole being drilled, -a aching ring at one end of the air box and a apted to hear u on 5,5 the face of the rock to be drilled, a flexible. air-tight joint between the back of the airbox andjthe drill, a spiral 8 ring, an adj ustable collar on the said d: by which the tension of the said spring is regulated and a lead-away pipe from the said air box termi- 4o natin in mecia in a rece taele,substantiallyas an for the urposes described.

2. The corn ination'with a ,hollow drill through which air .under pressure passes 'to the hole bein drilled, of a rigid air box sub-'45 rounding said drill and exterior of-the hole being drilled, a packing ring at one end of the air box and adapted to bear against the face of the rock to be drilled, a tapered seat 9, a.

block of packing 10, a spring 11, a collar 12 5'0 i .by which the said spring is adjusted, and a lead-away pipe from said air box passing into a purifier 16 substantially as and for the purposes described:

3. In a dust collector, the combination with a hollow drill throu h which air under 7 pressure passes to the ho 0 being drilled,' of a ri id air box around said drill and exterior of tee hole bein drilled, a packin ring at i one end of the air box and adapter to hear so u on the face of the rock to be drilled, a flexib e air-tight joint between the back of the air'box and the drill, means for exerting a. pressure against said air box to maintain the same in position againstthe rock in winch a 5 hole is to be drilled, adjustable means'wherev by the pressure exerted by the aforesaid means is regulatable and a lead-away pipe from the said air box, substantially as and for the purposes described.- 7 In testimony whereof I have signed my name to. this specification in the presence of two subscribing witnesses.

AUBREY cnuma BARTLETT. 

